A great plan can be undone by one badly delivered message.
You can do everything right on a change and still lose people in a single announcement. Communication is not a wrapper around the work. It is the part of the work most people actually experience.
Hard messages come in many forms: a reorganization, a layoff, a leader moving on, a decision that reverses something people care about. None of them get easy. Pretending otherwise is usually the first mistake. What you can control is how the message is prepared, how it is delivered, and what you do in the minutes after.